半干旱黄土丘陵沟壑区人工混交林土壤抗蚀性研究初报

半干旱黄土丘陵沟壑区, 在同一条件下, 0～100cm土层内, 有机质和水稳性团粒抗蚀性指标, 混交林较纯林分别高38%和23%; 分散率和分散系数抗蚀性指标, 混交构较纯林分别低3.5%和3.9%。经差异显著性检验, 有机质和水稳性团粒抗蚀性指标, 以99%概率保证, 差异极显著, 分散率和分散系数抗蚀指标, 以95%概率保证, 差异显著。但分层指标不规律。

A Preliminary Report of Study on Soil Anti-erodibility of Mixture-planted Forest in Semiarid Loess Hilly Gully Region

This paper studies mainly soilanti-erodibility indices of mixture-planted and pure-planted forest. Results show that soil organic material and water stable aggregate contents of mixed forest are greater than those of pure forest by 38% and 23% respectively, rate and coefficient of soil dispectively in 0-100 cm soil layers under the same condition. The difference of organic material and water stable aggregate contents between mixed and pure forest-land is extremely significant. The difference of rate and coefficient of dispersion between mixed and pure forest-land is significant, but the indices of various sooil layers is irregular.